code: def test_print_all_optimizers() -> None:
      # DOC_OPT_REGISTRY_0
      import nevergrad as ng
  
      print(sorted(ng.optimizers.registry.keys()))
  
file_path: nevergrad/nevergrad/optimization/test_doc.py
imports: import warnings
  import numpy
  import nevergrad
label_desc: Use image node_id 3 for calling a global function with example usage: test_print_all_optimizers() without return types